The OLD is a very good dictionnary for whom is translated clasiccal Latin. He also gave some etymologic track, what others do not. Its main lack is that it just cover Latin till IInd century a.c. whereas tle Lewis and short covers till IVth. So if you study mediaeval you'll need something like Niermeyer's lexikon (for example). Old is also very usefull and relevant for whom is not native english and have to translate into this language. So you can do very good things with others dictionnaries, but may be a little bit better with this one. The only one things is that it will never translate instead of you, improve your latin grammar and the OLD will improve your translation.
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